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The OSIRIS detector is a subsystem of the liquid scintillator fillling chainof the JUNO reactor neutrino experiment. Its purpose is to validate theradiopurity of the scintillator to assure that all components of the JUNOscintillator system work to specifications and only neutrino-grade scintillatoris filled into the JUNO Central Detector. The aspired sensitivity level of$10^{-16}$ g/g of $^{238}$U and $^{232}$Th requires a large ($\sim$20 m$^3$)detection volume and ultralow background levels. The present paper reports onthe design and major components of the OSIRIS detector, the detector simulationas well as the measuring strategies foreseen and the sensitivity levels to U/Ththat can be reached in this setup.

The Design and Sensitivity of JUNO's scintillator radiopurity pre-detector OSIRIS